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Kinetics of surface crystallization in thin films of poly(ethylene terephthalate)

Jukes, Paul C., Das, Arindam, Durell, Martin, Trolley, Dean, Higgins, Anthony M., Geoghegan, Mark, Macdonald, John Emyr, Jones, Richard A. L., Brown, Simon and Thompson, Paul 2005. Kinetics of surface crystallization in thin films of poly(ethylene terephthalate). Macromolecules 38 (6) , pp. 2315-2320. 10.1021/ma0490606

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In-situ grazing incidence X-ray diffraction has been used to investigate the kinetics of crystallization at the surface of thin films of poly(ethylene terephthalate) (PET). By varying the angle of incidence of the X-ray beam around the critical angle of the film, the penetration depth can be tuned to allow a direct comparison of molecular ordering in the surface and bulk of the film. The results show that ordering occurs significantly faster at the surface in the temperature range 90−100 °C (close to the bulk glass transition temperature of 75 °C). The (0 1̄ 1) and (0 1 0) peaks narrow more rapidly and achieve a lower width, indicating that the crystallization progresses more rapidly in these crystallographic directions. This enhanced ordering is attributed to a combination of surface energy effects, which promote localized packing, and to an enhanced segmental mobility near the free surface.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: ACS Publications
ISSN: 0024-9297
Last Modified: 04 Jun 2017 04:51

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